Help! I think I inadvertantly turned the wrong dial on my enlarger. The right side of my prints is very light. I seem to remember that you have to set the bellows for 35mm film but don't remember how to do it. There are three sets of numbers 2 1/4 X 2 1/4, 2 1/4 x 2 3/4, 2 1/4 x 3 1/4 but no mark to line them up to. Can anyone help me with this?